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  GBase8s开启SqlTrace跟踪
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  <h2 id="1-开启SQL跟踪"><a href="#1-开启SQL跟踪" class="headerlink" title="1  开启SQL跟踪"></a>1  开启SQL跟踪</h2><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_">#</span><span class="language-bash">开启SQL跟踪的参数</span></span><br><span class="line">level = [off, low, med, high]</span><br><span class="line">ntraces = [跟踪的SQL语句的数量]</span><br><span class="line">size = [每个跟踪缓冲区的大小，以KB为单位]</span><br><span class="line">mode = [global, user]</span><br><span class="line">level=low, ntraces=10000, size=10, mode=global</span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_">Shell&gt; </span><span class="language-bash">su - gbasedbt</span></span><br><span class="line"><span class="meta prompt_">Shell&gt; </span><span class="language-bash">dbaccess sysadmin -</span></span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash">高且全局</span></span><br><span class="line"><span class="meta prompt_">Shell&gt; </span><span class="language-bash">execute <span class="keyword">function</span> task (<span class="string">&quot;set sql tracing on&quot;</span>,30000, <span class="string">&quot;100&quot;</span>,<span class="string">&quot;high&quot;</span>,<span class="string">&quot;global&quot;</span>);<span class="string">&#x27;</span></span> </span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash"><span class="string">低且具体用户</span></span></span><br><span class="line"><span class="meta prompt_">Shell&gt; </span><span class="language-bash"><span class="string">execute function task(&quot;set sql tracing on&quot;, 20000, 10,&quot;low&quot;,&quot;user&quot;);</span></span> </span><br><span class="line"><span class="meta prompt_"></span></span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash"><span class="string">指定会话</span></span></span><br><span class="line"><span class="meta prompt_">Shell&gt; </span><span class="language-bash"><span class="string">execute function task(&quot;set sql user tracing on&quot;,11044);</span></span></span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h2 id="2-执行语句"><a href="#2-执行语句" class="headerlink" title="2  执行语句"></a>2  执行语句</h2><p>​		……或者运行业务。</p>
<h2 id="3-查询跟踪情况用命令"><a href="#3-查询跟踪情况用命令" class="headerlink" title="3 查询跟踪情况用命令"></a>3 查询跟踪情况用命令</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">onstat -g his</span><br></pre></td></tr></table></figure>

<h2 id="3-查询耗时最多的语句"><a href="#3-查询耗时最多的语句" class="headerlink" title="3 查询耗时最多的语句"></a>3 查询耗时最多的语句</h2><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> <span class="keyword">first</span> <span class="number">500</span> sql_runtime,sql_executions,sql_statement </span><br><span class="line"><span class="keyword">from</span> </span><br><span class="line">	syssqltrace t,</span><br><span class="line">	syssqltrace_iter i</span><br><span class="line"><span class="keyword">where</span> t.sql_id <span class="operator">=</span> i.sql_id </span><br><span class="line"><span class="keyword">order</span> <span class="keyword">by</span> <span class="number">1</span> <span class="keyword">desc</span>;</span><br></pre></td></tr></table></figure>

<h2 id="4-关闭SQL跟踪"><a href="#4-关闭SQL跟踪" class="headerlink" title="4  关闭SQL跟踪"></a>4  关闭SQL跟踪</h2><figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">echo &#x27; execute function sysadmin:task(&quot;SET SQL TRACING OFF&quot;); &#x27; | dbaccess sysadmin</span><br></pre></td></tr></table></figure>



<p>参数没改，重启trace失效：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta prompt_">#</span><span class="language-bash"><span class="comment">##################################################################</span></span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">SQL Tracing and EXPLAIN Plan Configuration Parameters</span></span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash"><span class="comment">##################################################################</span></span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">EXPLAIN_STAT - Enables (1) or disables (0) including the Query</span> </span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">               Statistics section <span class="keyword">in</span> the EXPLAIN output file</span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">SQLTRACE     - Configures SQL tracing. The format is:</span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">               SQLTRACE level=(low|med|high),ntraces=&lt;<span class="comment">#&gt;,size=&lt;#&gt;,</span></span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">               mode=(global|user)</span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">               Example:</span></span><br><span class="line"><span class="meta prompt_"># </span><span class="language-bash">               SQLTRACE level=low,ntraces=1000,size=2,mode=global</span></span><br><span class="line"><span class="meta prompt_">#</span><span class="language-bash"><span class="comment">##################################################################</span></span></span><br><span class="line"></span><br><span class="line">EXPLAIN_STAT 1</span><br><span class="line"></span><br></pre></td></tr></table></figure>

 
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